Englishfor English speakers
spontaneous
Adjective
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If something is spontaneous, it happens without any outside cause; nothing else makes it happen.
He made a spontaneous offer to help the old lady cross the street.
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If something is spontaneous, it is random.
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If something is spontaneous, it happens suddenly; it happens without any warning.
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If someone does something in a spontaneous way, it is done of their own free will or without making any plan to do so.
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If something is spontaneous, it was made without being planted by humans; it is indigenous.
reaction
Noun
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A reaction is an action that happens because of another action.
When he asked her to lunch, her first reaction was to say no.
In part, McKenna sees the move to smaller cars as a natural reaction to rising gasoline prices.
Fast reaction times are common in athletes.
When oxygen is added, a chemical reaction begins and heat is released.
A severe allergic reaction to the drug has killed five Americans.